Hello Friends,
I am writing some code for a KL04 chip. I want to define and use a global variable which can eventually be placed in a header file.
The value of that variable will be changed/modified in a few different functions. But, I am getting no result. The definition and usage are shown below
extern volatile uint8_t commState;
// - function 1 -- //
static void runMode(uint8_t commState){
uint8_t nextState;
volatile uint8_t commState;
nextState = commState;
dutyCycle = 10;
while(1){
// tempCountValSaved = tempCount;
stateChange(nextState,dutyCycle);
commTimerFunc(tempCount);
while(commutationFlag == 0){
}
commutationFlag = 0;
nextState--;
if(nextState >=6) nextState = 5;
// zeroCrossTempFlag = 0;
}
}
// -- function 2 -- //
| static uint8_t blindStartUp(uint8_t commState){ | |
| |
| | | | | | | | | |
uint8_t slotCounts = 0;
uint8_t nextState = 0;
uint8_t dutyCycle;
uint8_t rpmStartup = 0;
uint8_t rough = 0;
uint8_t initIteration = 0;
uint8_t runTime = 0;
uint8_t flagger = 0;
volatile uint8_t commState;
nextState = commState;
tempCount = 12000;
zeroCrossFlagDet = 0;
| |
| while(zeroCrossFlagDet != 1){ |
| while(tempCount >= 1500){ |
| |
| stateChange(nextState,dutyCycle); |
| commTimerFunc(tempCount); |
| while(commutationFlag == 0); |
| commutationFlag = 0; |
| nextState--; |
| if(nextState >=6) nextState = 5; | | |
| } | | |
| // --------------------------------------- // | | | | | | |
| if(zeroCrossFlagDet != 1){ |
| |
| } | | |
| commutationFlag = 0; | | |
| nextState--; |
| if(nextState >=6) nextState = 5; |
| zeroCrossTempFlag = 0; |
| } |
| } |
| asm("nop"); |
| |
| commState = nextState; |
| return(zeroCrossFlagDet); |
| } |
Now , in both these functions commState is being modified but there is no change.
The value what I give in the first time stays in commState. So, what exactly is the syntax of an
extern in Kinetis or rather Code Warrior.
Regards,
Vinod.
